資料來源 : Webster's Revised Unabridged Dictionary (1913)

Gravity \Grav"i*ty\, n.; pl. {Gravities}. [L. gravitas, fr.
   gravis heavy; cf. F. gravit['e]. See {Grave}, a., {Grief}.]
   1. The state of having weight; beaviness; as, the gravity of
      lead.

   2. Sobriety of character or demeanor. ``Men of gravity and
      learning.'' --Shak.